(Gecko:15145): GLib-GObject-CRITICAL **: g_object_set: assertion `G_IS_OBJECT (object)' failed

(Gecko:15145): GLib-GObject-CRITICAL **: g_object_set: assertion `G_IS_OBJECT (object)' failed

(Gecko:15145): GStreamer-CRITICAL **: gst_element_get_bus: assertion `GST_IS_ELEMENT (element)' failed

(Gecko:15145): GStreamer-CRITICAL **: gst_bus_set_sync_handler: assertion `GST_IS_BUS (bus)' failed

(Gecko:15145): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(Gecko:15145): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(Gecko:15145): GLib-GObject-CRITICAL **: g_object_set: assertion `G_IS_OBJECT (object)' failed